Portable air compressor



FIG. 1 is a left side elevational view of a portable air compressor showing my new design;

FIG. 2 is a rear elevational view thereof view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a portable air compressor, as shown. 